Unlike the MyBaxi app by BAXI (aka BDR Thermea Group), which already has a custom integration available for Home Assistant (see: remeha_home, Baxi’s HybridApp relies on the Servitly platform to provide its services.
For BAXI heat pumps and boilers connected via Servitly:
Is available the “Baxi HybridApp Home” custom integration.
You can find it on GitHub and it is available via HACS.
